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Financial risk management and financial instruments - Interest Rate Risk (Details)
R in Millions, $ in Millions
Jun. 30, 2019
USD ($)
Jun. 30, 2019
ZAR (R)
Jun. 30, 2018
USD ($)
Jun. 30, 2018
ZAR (R)
Dec. 31, 2015
USD ($)
Financial risk management and financial instruments          
Variable rate as a percentage of total financial assets 99.00% 99.00% 99.00% 99.00%  
Fixed rate as a percentage of total financial assets 1.00% 1.00% 1.00% 1.00%  
Variable rate as a percentage of total financial liabilities 40.00% 40.00% 54.00% 54.00%  
Fixed rate as a percentage of total financial liabilities 60.00% 60.00% 46.00% 46.00%  
Variable          
Financial risk management and financial instruments          
Financial assets   R 16,663   R 18,657  
Financial liabilities   (54,542)   (58,908)  
Net financial instruments   (37,879)   (40,251)  
Fixed          
Financial risk management and financial instruments          
Financial assets   197   97  
Financial liabilities   (83,151)   (51,144)  
Net financial instruments   (82,954)   (51,047)  
Interest rate swaps          
Financial risk management and financial instruments          
Financial assets   15   291  
Financial liabilities   R (1,488)   R (45)  
Interest rate swaps | Cash flow hedge          
Financial risk management and financial instruments          
Contract/Notional amount | $ $ 1,950   $ 2,000   $ 1,950